However you still need to experience GD for at least six months. Quoted from the APA website, "It lasts at least six months..." (the quote then goes on to describe diagnosis process). Therefore, you still need to have gender dysphoria in some form from the following criteria (again, quoted from APA)
"1. A marked incongruence between one's experienced/expressed gender and primary and/or secondary sex characteristics."
"A strong desire to rid of one's primary and/or secondary sex characteristics."
"A strong desire for the primary and/or secondary sex characteristics of the other gender,"
"A strong desire to be of the other gender"
"A strong desire to be treated as the other gender,"
"A strong conviction that one has the typical feelings and reaction of the other gender"
I understand not ALL people deal with it for years like I have, but you still need to experience it for a period of time.
To be transgender is to experience gender incongruency, and which is, as you said, quote the ICD-11, "a marked and persistent incongruence between an individual's experienced gender and assigned sex".
Also, according to the National Health Service of the United Kingdom, "...it's sometimes known as gender incongruence."
And also, in the APA, sometimes the two are slashed together to infer they are the same thing.
My take on this: Yes, GI and GD are very similar though not the same. However, trans people always want to rid their bodies of some thing that makes us our assigned sex. We want to be seen as who we are. I'm sorry but you just can't be trans without experiencing dysphoria, whether it's a large amount or a little.